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(gof)(x) = g(f(x))
= 3(2x + 5) + 4
= 6x + 15 + 4
= 6x + 19
(gof)(x) = 6x + 19
y = 6x + 19
6x = y - 19
x = (y - 19)/6
(gof)⁻¹(x) = (x - 19)/6
= 1/6 (x - 19)